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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Large-scale magnetic field structure of NGC 3627 based on a magnetic vector map
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Large-scale magnetic field structure of NGC 3627 based on a magnetic vector map

机译：基于磁矢量图的NGC 3627的大规模磁场结构

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摘要

We analyzed the data of Stokes I, Q, and U in the C and X bands and investigated the large-scale magnetic field structure of NGC 3627. The polarization intensity and angle in each bandwere derived using StokesQandUmaps. The rotation measurewas calculated using polarization angle maps. Moreover, the magnetic field strength was calculated by assuming energy equipartition with cosmic ray electrons. The structure of the magnetic fieldwas well aligned with the spiral arms, which were consistent with those in the former studies. We applied the magnetic vector reconstruction method to NGC 3627 to derive a magnetic vector map, which showed that the northern and southern disks were dominant with inward and outward magnetic vectors, respectively. Furthermore, we considered the large-scale structure of the magnetic field in NGC 3627 and observed that the structure is bi-symmetric spiral in nature, and that the number of magnetic field modes is mB = 1 in the outer region of galaxy. In addition, NGC 3627 has a mode of two spiral arms that were clearly visible in an optical image. The ratio of the mode of the spiral arms to that of the magnetic field is 2 : 1. In terms of NGC 3627, the large-scale magnetic field may be generated via the parametric resonance induced by the gravitational potential of the spiral arms.
机译：我们分析了C和X波段的斯托克斯I、Q和U数据，并研究了NGC3627的大尺度磁场结构。每个波段的偏振强度和角度都是用斯托克斯和乌马普斯推导出来的。使用偏振角图计算旋转测量值。此外，磁场强度是通过假设宇宙线电子的能量均分来计算的。磁场的结构与旋臂很好地对齐，这与之前的研究一致。我们将磁矢量重建方法应用于NGC 3627，得出了一张磁矢量图，该图显示北部和南部磁盘分别以向内和向外的磁矢量为主。此外，我们考虑了NGC 3627中磁场的大尺度结构，观察到该结构本质上是双对称螺旋结构，并且在星系外部区域的磁场模式数为mB=1。此外，NGC 3627具有两个旋臂模式，在光学图像中清晰可见。旋臂模式与磁场模式之比为2:1。根据NGC 3627，大尺度磁场可以通过螺旋臂引力势引起的参数共振产生。

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